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removing extraneous tempvar declarations from range generation by re-ordering...

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This commit is contained in:
Jeremy Ashkenas
2010-07-27 23:39:28 -04:00
parent a4156b71fa
commit 9d1fd38b69
2 changed files with 22 additions and 24 deletions
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17
src/nodes.coffee
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@@ -574,21 +574,20 @@ exports.RangeNode = class RangeNode extends BaseNode
compileArray: (o) ->
idt = @idt 1
vars = @compileVariables merge o, indent: idt
if @fromNum and @toNum and Math.abs(+@fromNum - +@toNum) <= 20
range = [+@fromNum..+@toNum]
range.pop() if @exclusive
return "[#{ range.join(', ') }]"
i = o.scope.freeVariable()
result = o.scope.freeVariable()
i = o.scope.freeVariable()
pre = "\n#{idt}#{result} = []; #{vars}"
if @fromNum and @toNum
if Math.abs(+@fromNum - +@toNum) <= 20
range = [+@fromNum..+@toNum]
range.pop() if @exclusive
return "[#{ range.join(', ') }]"
else
o.index = i
body = @compileSimple o
o.index = i
body = @compileSimple o
else
clause = "#@fromVar <= #@toVar ?"
body = "var #i = #@fromVar; #clause #i <#@equals #@toVar : #i >#@equals #@toVar; #clause #i += 1 : #i -= 1"
post = "{ #{result}.push(#i) };\n#{idt}return #result;\n#o.indent"
post = "{ #{result}.push(#i) };\n#{idt}return #result;\n#o.indent"
"(function() {#{pre}\n#{idt}for (#body)#post}).call(this)"
#### SliceNode